In previous games,banshees were considered a staple unit next to their guardians (dire avengers) and dark reapers. Dawn of war 3 is the first game in the franchise where banshees require power in addition to requisition to field. Eldar have no basic or specialized melee units. Assault marines are worth power because of the utility and mobility that they come with. Boyz are a basic combat unit suitable for fielding cheaply in large numbers.
The banshee, although having better damage than Boyz, do not have the utility or mobility of Assault marines. I do not think that they are strong or specialized enough to warrant any power cost. Eldar is already starved on power trying to build webways in the field, and while the dire avenger and dark reaper have all the lackluster of pure requisition units.
I think that banshee's (with damage/health adjusted accordingly) should not cost any power, and should cost only requisition in some amount. Maybe that amount should go up. I don't know. But I do know that banshees under-perform, and that trying to build them or replace them in meaningful numbers feels awful on power when I'm also trying to build requisition economy, get early upgrades, and expand webway influence on the map.
I'm curious what other people think?